Condensate Return & Flash Steam Calculator
1,000 kg/h of condensate at 10 bar g flashing to atmospheric pressure produces 133 kg/h of flash steam carrying approximately 300 kW of recoverable thermal energy. Enter your steam system pressures and condensate flow below to calculate flash steam generation and heat recovery potential.
This tool uses IAPWS-IF97 saturation data to calculate flash steam percentage, mass flow, heat recovery potential, annual energy value, and recommended condensate return pipe size.
Condensate Return Inputs
Flash Steam & Recovery Results
Heat Recovery Opportunity for iHEAT
This flash steam energy could be recovered by a Karnot iHEAT heat pump, upgrading waste heat to useful process temperatures with a COP of 3-5, saving up to 80% of the energy currently being vented.
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Flash Steam Formulas
Flash steam percentage:
Flash steam mass flow:
Heat recovery potential:
Frequently Asked Questions
What is flash steam and how is it calculated?
Flash steam forms when high-pressure condensate drops to a lower pressure. The percentage equals (hf_high - hf_low) / hfg_low x 100. This is because the excess enthalpy in the condensate must be released as latent heat to reach equilibrium at the lower pressure.
How much energy is lost in flash steam?
Flash steam carries significant energy. A typical 1,000 kg/h condensate flow at 10 bar g flashing to atmosphere produces roughly 133 kg/h of flash steam carrying about 300 kW of thermal energy that is often simply vented to the atmosphere.
Can a heat pump recover flash steam energy?
Yes. A Karnot iHEAT heat pump can absorb low-grade waste heat from flash steam and condensate, upgrading it to useful process temperatures. With a COP of 3 to 5, this recovers 60 to 80 percent of the energy that would otherwise be lost.
What pipe size do I need for condensate return?
Condensate return lines carry a two-phase mixture of liquid and flash steam. Since steam volume is much larger than liquid, the pipe must be sized for the total combined flow at typical velocities of 15 to 25 m/s. This calculator recommends a DN size based on total volumetric flow.
Recover Your Waste Steam Energy
Our engineers can design flash steam recovery systems using Karnot iHEAT heat pumps to slash your fuel consumption by up to 80%.
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